Regex
A regular expression is a sequence of characters that specifies a search pattern.
Table of Contents
Identifiers
| Identifier | Description |
|---|---|
\d |
any number |
\D |
anything but a number |
\s |
space |
\S |
anything but a space |
\w |
any character |
\W |
anything but a character |
\b |
the whitespace around words |
. |
any character expect for a new line |
\. |
a period |
Modifiers
| Modifier | Description |
|---|---|
{1, 3} |
we're expecting 1-3 ex: \d{1, 3} |
{x} |
expecting "x" ammount |
+ |
Match 1 or more |
? |
Match 0 or 1 |
* |
Match 0 or more |
$ |
Match the end of a string |
^ |
Matching the beginning of a string |
[] |
range or "variance" [A-Z] |
Misc
| Expression | Description |
|---|---|
^ |
negates a character class (eg: /[^g-f]/ – NOT between g and f) |
\W |
[^\w] |
\D |
[^\d] |
\S |
[^\s] |
(?:ABC) |
won't capture the group |
AB(?=C) |
lookahead, will match when AB is followed by C, but C won't be matched |
(?<name>.*) |
gives a group a name |